C# params with at least one value

Question

How can I have a parameter of params with at least one value?

public void Foo(params string[] s) { }  public void main() {     this.Foo(); // compile error     this.Foo(new string[0]); // compile error     this.Foo({ }); // compile error     this.Foo("foo"); // no error     this.Foo("foo1", "foo2"); // no error } 

Answer 1

Just do:

public void Foo(string first, params string[] s) { } 

Answer 2

You cannot specify such conditions for params at compile-time.

However, you can check this at run-time and throw an exception if your specified conditions are not met.